FIELD: mechanical engineering and other industries. SUBSTANCE: tubular casing that passes laser beam accommodates focusing lens. Nozzle feeding gas to treatment region is rigidly coupled with tubular casing. Concentric ring is installed outside of casing for turning about laser beam axis. Rocker arm is attached to ring by means of horizontal pin. One end of ring carries auxiliary optical focusing head for conveying auxiliary laser beam to treatment region. Its other end carries reflecting mirror mounted perpendicular to axis of auxiliary-head laser beam reflected from surface being treated. EFFECT: improved absorption factor of main laser beam due to pre-heating treatment region with auxiliary laser beam. 2 dwg
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